86688409 has 4 divisors (see below), whose sum is σ = 86816016. Its totient is φ = 86560804.

The previous prime is 86688379. The next prime is 86688421. The reversal of 86688409 is 90488668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86688409 - 2⁵ = 86688377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86688439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62779 + ... + 64144.

It is an arithmetic number, because the mean of its divisors is an integer number (21704004).

Almost surely, 2^86688409 is an apocalyptic number.

It is an amenable number.

86688409 is a deficient number, since it is larger than the sum of its proper divisors (127607).

86688409 is a wasteful number, since it uses less digits than its factorization.

86688409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127606.

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 86688409 is about 9310.6610399047. The cubic root of 86688409 is about 442.5751352939.

The spelling of 86688409 in words is "eighty-six million, six hundred eighty-eight thousand, four hundred nine".